fpdfsdk/ differences with XFA (for didactic purposes only).

fpdfsdk/src/fpdftext.cpp

Index: fpdfsdk/src/fpdftext.cpp
diff --git a/fpdfsdk/src/fpdftext.cpp b/fpdfsdk/src/fpdftext.cpp
index c8998aee9327c3497273e89701226ec059268296..741bbe718de966385ed6d519255c1a4288f46732 100644
--- a/fpdfsdk/src/fpdftext.cpp
+++ b/fpdfsdk/src/fpdftext.cpp
@@ -6,6 +6,10 @@
 
 #include "public/fpdf_text.h"
 
+#ifdef PDF_ENABLE_XFA
+#include "../include/fpdfxfa/fpdfxfa_doc.h"
+#include "../include/fpdfxfa/fpdfxfa_page.h"
+#endif
 #include "core/include/fpdfdoc/fpdf_doc.h"
 #include "core/include/fpdftext/fpdf_text.h"
 #include "fpdfsdk/include/fsdk_define.h"
@@ -18,7 +22,13 @@ DLLEXPORT FPDF_TEXTPAGE STDCALL FPDFText_LoadPage(FPDF_PAGE page) {
   CPDF_Page* pPDFPage = CPDFPageFromFPDFPage(page);
   if (!pPDFPage)
     return nullptr;
+#ifndef PDF_ENABLE_XFA
   CPDF_ViewerPreferences viewRef(pPDFPage->m_pDocument);
+#else
+  CPDFXFA_Page* pPage = (CPDFXFA_Page*)page;
+  CPDFXFA_Document* pDoc = pPage->GetDocument();
+  CPDF_ViewerPreferences viewRef(pDoc->GetPDFDoc());
+#endif
   IPDF_TextPage* textpage =
       IPDF_TextPage::CreateTextPage(pPDFPage, viewRef.IsDirectionR2L());
   textpage->ParseTextPage();